using System;
using System.Windows.Data;

namespace Helper.WPF
{
    [ValueConversion(typeof(double), typeof(double))]
    public sealed class InverseConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return -((double)value);
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            // we don't intend this to ever be called
            return null;
        }
    }
}
